Unibolt/Thunderbolt M8 X 100

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Unibolt/Thunderbolt M8 X 100

Product Code: Q17/UBOLT8X100

Size/Variation: 100mm - Full Product Description

In Stock Online


£1.80 inc VAT

M8 x 100mm Hex Head Thunderbolt

  • The original and bestselling all-purpose anchor
  • Self-tapping and suitable for concrete, stone, brick, marble, wood and block
  • Safe anchorage achieved without the need of high tightening forces
  • Can be removed and re-fixed into the same hole, providing the thread is correctly aligned
  • No expon forces mean close to edge fixing and reduced centre spacing distances
  • Uses include fixing handrails, post supports, timber battens and satellite dishes
  • Can be used be general builders, fencing contractors, property developers and maintenance, shop fitters, plumbers and restoration contractors

Thunderbolt Used on Materials

M8 x 100mm Technical Information for Installation

  • Drill Bit Dia. - 8mm
  • Max Fixture Thickness - 60mm
  • Min Embed Depth - 40mm
  • Min Over Drill Depth - 15mm
  • Clearance Drill Bit Dia. - 10mm
  • Max Tightening Torque - 40Nm
  • Anchor Length - 100mm
  • Washer Size - 10mm
  • Driver Type - 15 A/F
  • Min Hole Depth - 55mm

Thunderbolt Installation Instructions

  1. Drill at right angles using drill bit of same diameter ensuring hole is slightly deeper than the Thunderbolt.
  2. Remove any loose dust from the hole.
  3. Screw in the Thunderbolt with a socket wrench. Apply slight downward pressure to stathe self-tapping action.
  4. Tighten the Thunderbolt until the fixture is in place. If resistance is experienced whilst tightening, unscrew on turn and re-tighten, ensure not to over tighten.
  5. For optimum performance, use a torque wrench. Do not exceed maximum tightening torque.

Thunderbolt Installation Instructions

Please Note, if an impact wrench is to be used as means of installation, it must be torque controlled and the maximum tightening torque must not be exceeded.

Delivery Cost

Your delivery cost is calculated using the total value in your basket & the local delivery zone rates from your branch shown below (inc VAT).

Delivery Zones

Order less than £500 inc VAT

Zone 1 - £14.99

Zone 2 - £24.99

Zone 3 - £34.99

Zone 4 - £54.99

Zone 5 - £74.99

Delivery Zones

Order more than £500 inc VAT

Zone 1 - FREE

Zone 2 - FREE

Zone 3 - FREE

Zone 4 - £54.99

Zone 5 - £74.99

To check your local delivery zones, please select your nearest branch on our Branch Locator to view their delivery map.

We operate across the South East of England. However, we can sometimes offer deliveries outside of our standard areas. If you enter a postcode at checkout that is out of our normal delivery area we won't process your order but we will review it and let you know whether it's possible to deliver your order.

At Challenge Fencing your order can be delivered to your address or you can collect it for free from your chosen branch. If you want to collect your order, please wait until your local branch confirms your order is ready for collection.


If you have chosen to collect your goods from us, please wait until one of our team has contacted you before visiting your local branch. As stock available on the website is based on stock available across all the Challenge Fencing branches and may require a stock transfer to fulfil your collection!

Delivery Times

Our delivery service varies from the normal 1 - 2 working days to 4 - 5 working days depending on the time of year and demand levels.

Some made to order products can take up to 10 working days to deliver depending on demand levels.

We will confirm a suitable delivery date and our delivery team will contact you the day before delivery to confirm an estimated delivery time.

Delivery Area

Challenge Fencing deliver across the South East in areas divided into zones by postcode, based on the distance away from your local branch.

Your Delivery Day

We usually deliver your goods to the kerbside or a driveway entrance. The delivery vehicles can be heavy lorries that can damage private driveways by cracking paving slabs or lightweight drain covers etc. Goods are delivered off the sides of the vehicle only and the buyer should ensure that adequate means for unloading goods are available. For Health and Safety reasons goods cannot be moved over a long distance by Challenge Fencing Employees.

We strive to carry out our deliveries Monday - Friday, between 8am - 4pm, except on UK Bank Holidays. This varies depending on things like traffic and other exceptional circumstances beyond our control such as the weather. Where possible we will contact you prior to us arriving with a delivery time window. For further details of our delivery service please read our Terms & Conditions of Sale & Purchasing


If you have any questions please don't hesitate to contact your nearest branch.

The Friendliest, Easiest and Most Modern way to buy a fence, deck, shed or gate.

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